Descartes
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The Rectangular Coordinate Plane
"Horizontal", in this context, means from left to right (or from right to left).
The coordinate plane is sometimes call the Cartesian plane because Rene Descartes is often credited with inventing the coordinate plane and so the coordinate plane is sometimes called the Cartesian plane,in his honor.
the coordinate plane is a map of points
First, a coordinate. A coordinate is a number. It labels a point on a line.Second, a coordinate axis is a line with coordinates.to label a point in a plane (a flat surface), we need more than one coordinate axis, and we place a second at right angles to the first.Those axes are called rectangular coordinate axes, because they are at right angles to one another. The coordinates on them are called rectangular coordinates. They are also called Cartesian coordinates.